Spiral sealing element and shell-and-tube heat exchanger

Abstract

The spiral sealing piece comprises a fixing part, a flexible sealing part and a deformation capacity part, the flexible sealing part is connected with the fixing part, the outer side end of the flexible sealing part protrudes out of the outer edge of the spiral piece in the radial direction of the spiral piece, and the deformation capacity part is arranged on the fixing part and away from the edge of the spiral piece. The inner side end of the flexible sealing part is connected with the fixing part through the deformation capacity part. A spiral sealing piece is arranged on the outer edge of the upstream side of a spiral baffle plate, and a flexible sealing part of the spiral sealing piece is bent towards the upstream side of the spiral baffle plate and abuts against the inner wall of a heat exchanger cylinder, so that the flexible sealing part abuts against the inner wall of the heat exchanger cylinder all the time under the action of radial elastic tension; a gap between the spiral baffle plate and the inner wall of the heat exchanger cylinder is blocked; meanwhile, the deformation capacity part provides the bending radius for the flexible sealing part, the problem that the flexible sealing part is broken when the bending angle is too large is avoided, and then the flexible sealing part can adapt to the change of the gap between the spiral baffle plate and the inner wall of the heat exchanger barrel.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, and particularly relates to a spiral seal and a shell-and-tube heat exchanger. Background Art

[0002] The shell-and-tube heat exchanger, also known as a tubular heat exchanger or a tubular condenser, is widely used in the convective heat transfer of "liquid-liquid", "steam-steam", "steam-liquid" heat exchange in fields such as chemical industry, petroleum, medicine, food, light industry, metallurgy, and coking, as well as heat exchange and condensation processes such as steam condensation and liquid evaporation heat transfer. The shell-and-tube heat exchanger is composed of components such as a tube box, a shell, a tube sheet, a spiral baffle, heat exchange tubes, nozzles, and flanges. The purpose of the spiral baffle is to increase the flow velocity of the shell-side fluid and continuously change the flow direction of the fluid, so as to intensify the degree of turbulence and improve the convective heat transfer coefficient of the shell-side fluid.

[0003] Since it is necessary to ensure that the tube bundle containing the spiral baffle can be smoothly inserted into the cylinder during installation, and there is a roundness deviation in the cylinder (the national standard requires that the circumferential deviation is not more than 10 mm and the diameter deviation is not more than 0.5%), there is always a gap between the spiral baffle and the inner wall of the heat exchanger cylinder, and the fluid will directly leak from the gap between the spiral baffle and the inner wall of the heat exchanger cylinder, resulting in a reduction in heat transfer efficiency. At the same time, during the transportation, installation, or operation of the shell-and-tube heat exchanger, the gap between the spiral baffle and the inner wall of the heat exchanger cylinder will change; when the cylinder is placed horizontally, under the action of its own gravity, the gap between the spiral baffle and the upper inner wall of the heat exchanger cylinder increases, and the gap between the spiral baffle and the lower inner wall of the heat exchanger cylinder decreases, and even the spiral baffle directly abuts against the lower inner wall of the heat exchanger cylinder. Thus, not only a seal needs to be provided between the spiral baffle and the inner wall of the heat exchanger cylinder, but also the seal needs to have good radial elastic tension so that it can adapt to the change in the gap between the spiral baffle and the inner wall of the heat exchanger cylinder.

[0004] The utility model patent with the publication number CN202002537U discloses a sealing device for eliminating the gap between the spiral baffle and the shell of a shell-and-tube heat exchanger, which includes a spiral baffle and a fastener. It is characterized in that an annular sealing strip with an L-shaped flange is provided at the semi-circular edge part of the spiral baffle, and an annular pressing strip of the same length and matching with the annular sealing strip is provided on one side of the annular sealing strip. The sealing strip in this solution has good radial elastic tension; however, it can be seen from its specification and drawings that the annular sealing strip is arranged on the back water side of the spiral baffle and bends towards the water inlet side to abut against the cylinder wall; when the spiral baffle directly abuts against the inner wall of the heat exchanger cylinder, the part of the sealing strip facing the water inlet side is directly pressed into a vertical 90° under the limit abutment of the spiral baffle. The metal seal is easily broken at this bending angle, and in this case, the spiral baffle vertically abuts against the bending part of the sealing strip, which is also easy to directly cut off the bending part of the sealing strip, and it cannot adapt to the gap change between the spiral baffle and the inner wall of the heat exchanger cylinder.

[0005] Therefore, there is an urgent need to provide a spiral seal and a shell-and-tube heat exchanger that have good radial elastic tension and can adapt to the gap change between the spiral baffle and the inner wall of the heat exchanger cylinder. Summary of the Utility Model

[0006] The purpose of the present utility model is to overcome the above technical deficiencies and provide a spiral seal and a shell-and-tube heat exchanger that have good radial elastic tension, can adapt to the gap change between the spiral baffle and the inner wall of the heat exchanger cylinder, and ensure that the gap between the spiral baffle and the inner wall of the heat exchanger cylinder is always sealed.

[0007] To achieve the above technical purpose, the technical solution of the present utility model provides a spiral seal, which includes:

[0008] A fixing part, which is used for fixedly connecting with the outer edge of the spiral part;

[0009] A flexible sealing part, the inner end of the flexible sealing part is connected to the fixing part, and its outer end protrudes radially outward from the outer edge of the spiral part along the radial direction of the spiral part;

[0010] Wherein, a deformation capacity part is provided at a distance from the edge of the spiral part on the fixing part, and the inner end of the flexible sealing part is connected to the fixing part through the deformation capacity part.

[0011] Preferably, the flexible sealing part is a metal sheet with flexible deformation performance.

[0012] Preferably, the radial width of the deformation capacity part is not less than the bending radius of the flexible sealing part.

[0013] Preferably, the radial distance between the deformation capacity part and the edge of the spiral part is 1 mm - 200 mm.

[0014] Preferably, the fixing part fixes the flexible sealing part to the outer edge of the spiral part by riveting, bolting or welding.

[0015] The present utility model also provides a shell-and-tube heat exchanger comprising the above-mentioned spiral seal, which includes:

[0016] A heat exchanger cylinder;

[0017] A spiral baffle plate coaxially arranged inside the heat exchanger cylinder;

[0018] A spiral seal, the spiral seal is arranged on the outer edge of the water-facing side of the spiral baffle plate through a fixing part, and the flexible sealing part of the spiral seal bends towards the water-facing side of the spiral baffle plate and abuts against the inner wall of the heat exchanger cylinder.

[0019] Preferably, the outer end of the flexible sealing part is in contact with the inner wall surface of the heat exchanger cylinder.

[0020] Preferably, the fixing part fixes the flexible sealing part to the water-facing side of the spiral part by riveting, bolting or welding.

[0021] Preferably, the radially expanded width of the outer end of the flexible sealing part is greater than the clearance width between the edge of the spiral baffle plate and the inner wall of the heat exchanger cylinder.

[0022] Preferably, the radial width of the deformation capacity part is greater than the clearance width between the edge of the spiral baffle plate and the inner wall of the heat exchanger cylinder.

[0023] Compared with the prior art, the beneficial effects of the present utility model include:

[0024] For the spiral seal of the present utility model, its flexible sealing part can undergo axial bending deformation when abutted by an abutting object and has radial elastic tension, so that within the range of tension change, it can always abut against the abutting object. While the flexible sealing part is deformed by abutment, the deformation capacity part provides a bending radius for the flexible seal, avoiding the problem that the flexible sealing part is broken when the bending angle is too large.

[0025] For the shell-and-tube heat exchanger of the present utility model, by arranging a spiral seal on the outer edge of the water-facing side of the spiral baffle plate and setting the flexible sealing part of the spiral seal to bend towards the water-facing side of the spiral baffle plate and abut against the inner wall of the heat exchanger cylinder, the flexible sealing part of the spiral seal is always abutted against the inner wall of the heat exchanger cylinder under the action of radial elastic tension, sealing the gap between the spiral baffle plate and the inner wall of the heat exchanger cylinder; at the same time, the deformation capacity part of the spiral seal provides a bending radius for the flexible seal, avoiding the problem that the flexible sealing part is broken when the bending angle is too large, and thus enabling it to adapt to the gap change between the spiral baffle plate and the inner wall of the heat exchanger cylinder.

[0026] In the shell-and-tube heat exchanger of the present utility model, the flexible sealing part is fixed to the water-facing side of the spiral part through the fixing part, and its outer end abuts against the inner wall of the heat exchanger cylinder. The inner wall of the heat exchanger cylinder provides a radial supporting force for the outer end of the flexible sealing part attached thereto; when the fluid impacts the spiral baffle, the outer end of the flexible sealing part can be further closely attached to the inner wall of the heat exchanger cylinder under the action of the fluid pressure. Brief Description of the Drawings

[0027] Figure 1 is a three-dimensional structural schematic diagram of the spiral seal of the embodiment of the present utility model.

[0028] Figure 2 is a half-sectional schematic diagram of the shell-and-tube heat exchanger of the embodiment of the present utility model.

[0029] Figure 3 is a sectional schematic diagram of the spiral seal of the embodiment of the present utility model abutting against the inner wall of the shell-and-tube heat exchanger cylinder.

[0030] The markings of the components in the drawings are as follows:

[0031] 1. Spiral seal; 11. Fixing part; 12. Flexible sealing part; 13. Deformation capacity part; 2. Heat exchanger cylinder; 3. Spiral baffle. Detailed Description of the Embodiment

[0032] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] Aiming at the problem that there is a gap between the spiral baffle 3 and the inner wall of the heat exchanger cylinder 2 in the tube heat exchanger, and the fluid will directly leak from the gap between the spiral baffle 3 and the inner wall of the heat exchanger cylinder 2, resulting in a reduction in heat transfer efficiency; although there is a proposal in the prior art to use a seal to block the gap between the spiral baffle 3 and the inner wall of the heat exchanger cylinder 2, it is found in actual application that the radial elastic tension of the existing seal is insufficient or the seal is prone to breakage.

[0034] To solve the above problems, the present utility model provides a spiral seal, as Figure 1As shown in the figure, the spiral seal 1 includes a fixing part 11, a flexible seal part 12 and a deformation capacity part 13. Among them, the fixing part 11 is used for fixedly connecting with the outer edge of the spiral part. The inner end of the flexible seal part 12 is connected to the fixing part 11, and its outer end protrudes radially outward from the outer edge of the spiral part along the radial direction of the spiral part. The width of the flexible seal part 12 protruding from the outer edge of the spiral part is greater than the width of the gap to be blocked along the radial direction of the spiral part. There is a deformation capacity part 13 at a distance from the edge of the spiral part on the fixing part 11, and the inner end of the flexible seal part 12 is connected to the fixing part 11 through the deformation capacity part 13. The flexible seal part 12 can undergo axial bending deformation when abutted by an abutting object and has radial elastic tension, so that within the range of tension change, it can always abut against the abutting object. While the flexible seal part 12 is deformed by abutment, the deformation capacity part 13 provides a bending radius for the flexible seal, avoiding the problem that the flexible seal part 12 breaks when the bending angle is too large.

[0035] It can be understood that when the spiral seal 1 is applied to a device with a relatively large volume, it needs to meet a certain rigidity to match the overall compressive capacity of the device; therefore, the flexible seal part 12 is preferably made of a metal sheet with flexible deformation performance.

[0036] As Figure 3 shown in the figure, when the flexible seal part 12 of the spiral seal 1 abuts against an abutting object, its outer end is abutted and undergoes axial bending deformation. Under the action of radial elastic tension, a surface contact is formed between the outer end and the abutting object to achieve sealing. At this time, the side of the deformation capacity part 13 connected to the flexible seal part 12 undergoes axial deflection under the drive of the flexible seal part 12, providing a bending radius for the bending deformation of the flexible seal part 12 and avoiding the flexible seal part 12 from breaking due to an excessive bending angle. Therefore, the radial width of the deformation capacity part 13 is not less than the bending radius of the flexible seal part 12. Further preferably, the radial distance of the deformation capacity part 13 from the edge of the spiral part is 1 mm - 200 mm.

[0037] Based on the above spiral seal 1, the present invention also provides a shell-and-tube heat exchanger, which includes a heat exchanger cylinder body 2, a spiral baffle 3 and a spiral seal 1. As Figure 2 and Figure 3 shown in the figure, the spiral baffle 3 is coaxially arranged inside the heat exchanger cylinder body 2. The spiral seal 1 is arranged on the outer edge of the water-facing side of the spiral baffle 3 through the fixing part 11. The flexible seal part 12 of the spiral seal 1 bends towards the water-facing side of the spiral baffle 3 and abuts against the inner wall of the heat exchanger cylinder body 2. Under the action of radial elastic tension, the flexible seal part 12 of the spiral seal 1 always abuts against the inner wall of the heat exchanger cylinder body 2, sealing the gap between the spiral baffle 3 and the inner wall of the heat exchanger cylinder body 2.

[0038] As Figure 2 and Figure 3As shown in the figure, the flexible sealing part 12 is fixed to the water-facing side of the helical baffle 3 through the fixing part 11, and its outer end abuts against the inner wall of the heat exchanger cylinder body 2. The inner wall of the heat exchanger cylinder body 2 provides a radial supporting force for the outer end of the flexible sealing part 12 attached thereto. When the fluid impacts the helical baffle 3, the outer end of the flexible sealing part 12 can be further closely attached to the inner wall of the heat exchanger cylinder body 2 under the action of the fluid pressure. Preferably, the fixing part 11 can fix the flexible sealing part 12 to the water-facing side of the helical baffle 3 by riveting, bolting or welding.

[0039] It can be understood that the flexible sealing part 12 needs to cross the gap between the helical baffle 3 and the inner wall of the heat exchanger cylinder body 2 and abut against the inner wall of the heat exchanger cylinder body 2 to undergo axial bending deformation, forming a surface contact seal with the inner wall of the heat exchanger cylinder body 2. Therefore, the radially expanded width of the outer end of the flexible sealing part 12 is greater than the gap width between the edge of the helical baffle 3 and the inner wall of the heat exchanger cylinder body 2.

[0040] At the same time, it should be further explained that when the outer end of the flexible sealing part 12 abuts against the inner wall of the heat exchanger cylinder body 2 and undergoes axial bending deformation, in order to prevent the flexible sealing part 12 from breaking due to excessive bending angle, the side of the deformation capacity part 13 connected to the inner end of the flexible sealing part 12 undergoes axial deflection under the drive of the flexible sealing part 12, providing a bending radius for the bending deformation of the flexible sealing part 12, so that it can adapt to the gap change between the helical baffle 3 and the inner wall of the heat exchanger cylinder body 2. Therefore, the radial width between the fixing part 11 and the inner wall of the heat exchanger cylinder body 2 is not less than the bending radius of the flexible sealing part 12. Specifically, in some preferred embodiments, the radial width of the deformation capacity part 13 is not less than the bending radius of the flexible sealing part 12, so as to ensure that the flexible sealing part 12 will not break due to excessive bending angle by limiting the radial width of the deformation capacity part 13. Further preferably, the radial width of the deformation capacity part 13 is greater than the gap width between the edge of the helical baffle 3 and the inner wall of the heat exchanger cylinder body 2. Specifically, the radial distance between the deformation capacity part 13 and the edge of the helical baffle 3 is 1 mm - 200 mm.

[0041] In summary, a helical seal and a shell-and-tube heat exchanger provided by an embodiment of the present invention set a helical seal 1 at the outer edge of the water-facing side of the helical baffle 3, and set the flexible sealing part 12 of the helical seal 1 to bend towards the water-facing side of the helical baffle 3 and abut against the inner wall of the heat exchanger cylinder body 2, so that the flexible sealing part 12 of the helical seal 1 always abuts against the inner wall of the heat exchanger cylinder body 2 under the action of the radial elastic tension, sealing the gap between the helical baffle 3 and the inner wall of the heat exchanger cylinder body 2. At the same time, the deformation capacity part 13 of the helical seal 1 provides a bending radius for the flexible seal, avoiding the problem that the flexible sealing part 12 breaks when the bending angle is too large, and further enabling it to adapt to the gap change between the helical baffle 3 and the inner wall of the heat exchanger cylinder body 2.

[0042] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present utility model by using the above-disclosed technical content. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A spiral seal, characterized in that: include: A fixing portion, the fixing portion being used for fixedly connecting with the outer edge of the spiral member; A flexible sealing portion, wherein the inner end of the flexible sealing portion is connected to the fixing portion, and the outer end of the flexible sealing portion protrudes radially outward from the outer edge of the spiral member; Wherein, the fixing portion is provided with a deformation capacity portion away from the edge of the spiral component, and the inner end of the flexible sealing portion is connected to the fixing portion through the deformation capacity portion.

2. The spiral seal according to claim 1, characterized in that The flexible sealing part is a metal sheet with flexible deformation performance.

3. The spiral seal according to claim 1, characterized in that The radial width of the deformation capacity portion is not less than the bending radius of the flexible sealing portion.

4. The spiral seal according to claim 3, characterized in that: The radial distance between the deformation capacity portion and the edge of the spiral element is 1 mm-200 mm.

5. The spiral seal according to claim 1, characterized in that: The fixing part fixes the flexible sealing part to the outer edge of the spiral member by riveting, bolting or welding.

6. A shell and tube heat exchanger, characterized in that: include: Heat exchanger shell; A spiral baffle, wherein the spiral baffle is coaxially arranged in the heat exchanger cylinder; The spiral seal as claimed in any one of claims 1 to 5, wherein the spiral seal is arranged on the outer edge of the water-facing side of the spiral baffle through a fixing portion, and the flexible sealing portion of the spiral seal is bent toward the water-facing side of the spiral baffle and abuts against the inner wall of the heat exchanger cylinder.

7. The shell and tube heat exchanger according to claim 6, characterized in that: The outer end of the flexible sealing portion contacts the inner wall surface of the heat exchanger cylinder.

8. The shell and tube heat exchanger according to claim 6, characterized in that: The fixing part fixes the flexible sealing part to the water-facing side of the spiral component by riveting, bolting or welding.

9. The shell and tube heat exchanger according to claim 6, characterized in that: The radially expanded width of the outer end of the flexible sealing portion is greater than the gap width between the edge of the spiral baffle and the inner wall of the heat exchanger cylinder.

10. The shell and tube heat exchanger according to claim 9, characterized in that: The radial width of the deformation capacity portion is greater than the gap width between the edge of the spiral baffle and the inner wall of the heat exchanger cylinder.

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